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1. Electrical constants were determined on isolated single fibres or on fibres from bundles from frog's twitch muscles by analysing the low frequency cable properties.

2. The sarcoplasmic conductivity (G_i) was 5·9 mmho/cm at 20° C, and its temperature coefficient (Q₁₀) was 1·37.

3. The Q₁₀ of the membrane conductance (G_M) was 1·49, and that of the membrane capacity (C_M) was 1·02.

4. C_M increases with diameter (D) in an approximately linear manner: the values were 4·6 µF/cm² at D = 50 µ, and 8·5 µF/cm² at D = 130 µ.

5. G_M also increases with diameter, being 0·21 mmho/cm² at D = 50 µ and 0·37 mmho/cm² at D = 130 µ.

6. These results suggest that the transverse tubular system contributes substantially to the values of low frequency capacity and conductance measured at the surface membrane.

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